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MAX4734 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX4734 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 11 page Detailed Description The MAX4734 is a low 0.8 Ω max (at V+ = 2.7V) on- resistance, low-voltage, 4-channel CMOS analog multi- plexer that operates from a 1.6V to 3.6V single supply. CMOS switch construction allows switching analog sig- nals that range from GND to V+. When powered from a 2.7V supply, the 0.8 Ω max RON allows high continuous currents to be switched in a variety of applications. Applications Information Proper power-supply sequencing is recommended for all CMOS devices. Do not exceed the absolute maxi- mum ratings, because stresses beyond the listed rat- ings can cause permanent damage to the devices. Always sequence V+ on first, followed by NO_ or COM. Although it is not required, power-supply bypassing improves noise margin and prevents switching noise propagation from the V+ supply to other components. A 0.1µF capacitor, connected from V+ to GND, is ade- quate for most applications. Logic Inputs The MAX4734 logic inputs can be driven up to 3.6V regardless of the supply voltage. For example, with a 1.8V supply, A_ and EN may be driven low to GND and high to 3.6V. Driving A_ and EN rail-to-rail minimizes power consumption. Analog Signal Levels Analog signals that range over the entire supply voltage (V+ to GND) can be passed with very little change in on- resistance (see Typical Operating Characteristics). The switches are bidirectional, so the NO_ and COM_ pins can be used as either inputs or outputs. Layout High-speed switches require proper layout and design procedures for optimum performance. Reduce stray inductance and capacitance by keeping traces short and wide. Ensure that bypass capacitors are as close to the device as possible. Use large ground planes where possible. 0.8 Ω, Low-Voltage, 4-Channel Analog Multiplexer _______________________________________________________________________________________ 7 50% tOFF tR < 5ns tF < 5ns 0 0 VEN = VIH + 0.5 VOUT 90% 90% tON V+ VOUT GND V+ A1 A0 EN NO1 NO2–NO4 COM VNO_ RL MAX4734 35pF VEN V+ Figure 1. Switching Time Test Circuits/Timing Diagrams |
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